The effects of twisted magnetic field on coronal loop oscillations and dissipation

The standing magnetohydrodynamic (MHD) modes in a cylindrical incompressible magnetic flux tube modelled as a straight core surrounded by a magnetically twisted annulus, both embedded in a straight ambient external field, are considered. The dispersion relation for the MHD waves is derived and solve...

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Bibliographic Details
Published inMonthly notices of the Royal Astronomical Society Vol. 394; no. 1; pp. 521 - 526
Main Authors Karami, K., Barin, M.
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Publishing Ltd 21.03.2009
Wiley-Blackwell
Oxford University Press
Subjects
Astronomy
Astrophysics
Earth, ocean, space
Exact sciences and technology
Fluid dynamics
Kinematics
Magnetic fields
Sun
Sun: corona
Sun: magnetic fields
Sun: oscillations
Sun: oscillations
Sun: corona
Sun: magnetic fields
Damping
Magnetic flux
Magnetohydrodynamics
MHD waves
Dispersion relations
Flux tubes
Kinks
Sun
Coronal loop
Magnetic fields
Viscous dissipation
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Summary:The standing magnetohydrodynamic (MHD) modes in a cylindrical incompressible magnetic flux tube modelled as a straight core surrounded by a magnetically twisted annulus, both embedded in a straight ambient external field, are considered. The dispersion relation for the MHD waves is derived and solved numerically to obtain the frequencies of both the kink (m= 1) and fluting (m= 2, 3) waves. Damping rates due to both viscous and resistive dissipations in the presence of the twisted magnetic field are derived and solved numerically for both the kink and fluting waves.
Bibliography:ark:/67375/HXZ-Z9JL7NZ8-W
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ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2008.14360.x